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Nanowires transport electrons extracellularly: sediment bacteria


A Beggiatoa bacterial mat at the Blake Ridge / Hadal / LicensePD - Public Domain

Nanowires in sediment bacteria transport electrons extracellularly by linking distant chemical reactions to create electrical impulses

"Bacteria lurking in sediment at the bottom of the sea are pulling off a clever trick — using an electric current to link together the chemical reactions of oxygen in water with those of sediment nutrients deeper down.

"Lars Peter Nielsen at Aarhus University in Denmark and his colleagues suggestthat a chain of bacteria work together to transport electrons from a marine sediment to the overlying water up to two centimetres away. The electrons are produced by reactions between organic matter and hydrogen sulphide in the sediment, and transported to the sediment surface where they react with oxygen.

"This means that throughout the entire system, the top layers of sediment 'breathe' for the whole, and those at the bottom 'eat' for the whole.

"The research helps to add weight to a suggestion within the geophysics and microbiology communities that bacteria can grow tiny 'wires' and hook up to form a biogeobattery — a giant natural battery that generates electrical currents." (Sanderson 2010)

"Oxygen consumption in marine sediments is often coupled to the oxidation of sulphide generated by degradation of organic matter in deeper, oxygen-free layers. Geochemical observations have shown that this coupling can be mediated by electric currents carried by unidentified electron transporters across centimetre-wide zones. Here we present evidence that the native conductors are long, filamentous bacteria. They abounded in sediment zones with electric currents and along their length they contained strings with distinct properties in accordance with a function as electron transporters. Living, electrical cables add a new dimension to the understanding of interactions in nature and may find use in technology development." (Pfeffer et al. 2012:218)
About the inspiring organism

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Organism/taxonomy data provided by:
Species 2000 & ITIS Catalogue of Life: 2008 Annual Checklist

Bioinspired products and application ideas

Application Ideas: Converting renewable biomass such as compost, human, and animal waste into electricity. Creating small amounts of electricity to power underground irrigation systems or water pumps. Creating microbial fuel cells generated from electron donors in wastewater. Creating nanowires in small circuits or electronic devices and connecting them to create a microscopic grid.

Industrial Sector(s) interested in this strategy: Agriculture, forestry and fishing, Electricity, gas, steam and air conditioning supply, Water supply, sewerage, waste management and remediation activities,

Department of Biological Sciences
Dr. Lars Peter Nielsen
Aarhus University
Sanderson K. 2010. Bacteria buzzing in the seabed. Nature News [Internet],
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Nielsen LP; Risgaard-Petersen N; Fossing H; Christensen PB; Sayama M. 2010. Electric currents couple spatially separated biogeochemical processes in marine sediment. Nature. 463: 1071-1074.
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Pfeffer C; Larsen S; Song J; Dong M; Besenbacher F; Meyer RL; Kjeldsen KU; Schreiber L; Gorby YA; El-Naggar MY; Leung KM; Schramm A; Risgaard-Petersen N; Nielsen LP. 2012. Filamentous bacteria transport electrons over centimetre distances. Nature. 491(7423): 218-221.
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